This is going to throw laws for a loop. For example, in a game allow PvP, I could kill another player, loot the corpse, and profit from it- which is perfectly legal. Obviously, the same action in the real world carries much different consequences. So we have to revisit the entire idea of crime in a contextual way- someone playing a thief character, using game features to steal from you, is immune from prosecution, but someone who exploits flaws or hacks the game, is not.
What I find interesting that these things are happening in Asia right now. Murders over in-game theft. Arrests for in-game mugging. What are we going to do when this moves into the US?